1) Foolish n00b. One who is n00bish, with an extra touch of idiocy
2) Fake n00b. One who pretends to be a n00b for the purposes of amusement, testing his/her fellow forum members' reactions, etc.
1) Whoa, what a f00b. That guy just sniped his own commander.
2) f00b account: lolzlike0mgimn00kanu guiz hlep me?
Smart forum member: Stfu, we all know it's TheFourHorsemen.